The reactions between SO2 and C2H2 (and C2H4) at elevated temperatures. A single-pulse shock tube investigation

✍ Scribed by R. Fifer; R. Moreau; S. H. Bauer

• Publisher: John Wiley and Sons
• Year: 1971
• Tongue: English
• Weight: 950 KB
• Volume: 3
• Category: Article
• ISSN: 0538-8066
• DOI: 10.1002/kin.550030306

✦ Synopsis

The high-temperature reaction between sulfur dioxide and acetylene in an excess of argon was studied in a l-in. i.d. single-pulse shock tube. Mixturesranging from l.81yo to 5.4070 SO2 and 1.60% to 4.90% CZHt were heated to reflected shock temperatures of 1550"-2150"K, for dwell times of about 0.6 msec and gas dynamically quenched. Total reaction densities were 0.89 to 5.4 X The reaction products were analyzed by gas chromatography. A technique was developed for separating Ar, CzH4, C ~H Z , SOZ, CO, COZ, HZS, COS, and CSZ. The major products of the reaction are CO, Hz, CSz, and sulfur. The products observed were compared with those predicted on the assumption that equilibrium was attained. Several preliminary experiments were carried out with ethylene-sulfur dioxide mixtures, and the results indicated that for this combination the sulfur dioxide probably reacted with the acetylene generated from the decomposition of the ethylene, rather than directly with the ethylene. The rate of decline in the sulfur dioxide content in CzH2-SOZ mixtures was found to be approximately second order (total) and can be empirically represented by moles/l. -A ( s o z ) / A t = 3.1 X 1010T1/2 exp( -40,800/RT)[Ar]0~83[S0~]0~87[C~H~]o~z5 mole ~m -~ sec-I A mechanism is proposed to account for the overall reaction kinetics.